<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>盒子框架</title>
		<style type="text/css">
			.one {
				width: 43.75rem;
				height: 3.125rem;
				border-left: 3px solid blueviolet;
				border-top: 50%;
				border-right: 3px solid blueviolet;
				border-right: 3px solid blueviolet;
			}
		</style>
	</head>
	<body>
		<div class="one"></div>
		<div class="two"></div>
		<div class="three"></div>
		<div class="four"></div>
		
	</body>
</html>
